Common Core Math Vocabulary

Metric System - Definition with Examples

What is Metric System ?

Metric System Definition: The metric system is a system of measurement that involves measuring length, mass and volume in their respective units.

1. Length

Millimetre (mm), Decimetre (dm), Centimetre (cm), Meter (m), and Kilometre (km) are used to measure how long or wide or tall an object is.

a. Millimetre (mm) and Centimetre (cm) are used to measure short lengths. Example: Tip of pen/pencil, thickness of debit card, stapler pins etc.

Thickness of debit card in milimeter

b. Metre (m) is used to measure longer lengths. Example: Cloth measuring rod, tape, ribbon etc.

Height of truck in meter

c. Kilometre (km) is used to measure very long distances. Example: Distance between 2 cities.

Distance between two places in kilometer

2. Weight

Gram (g) and Kilogram( kg) are used to measure how heavy an object is.

a. Gram (g) is a unit used to measure lighter objects. Example: slice of a bread, paper clip, or weight of balloon etc.

b. Kilogram (kg) is a unit used to measure heavier objects. Example: human body weight, cylinders, or watermelon etc.

Different types of measuring instruments are used to weigh different objects.

Types of measuring instruments to weigh

3. Capacity

Millilitre (ml) and Litre (l) are used to measure how much quantity of liquid an object can hold.

a. Millilitre (ml) is the unit used to measure small quantity of liquid. Example: Eye dropper, juice can, medicine doses etc.

Measure capacity in mililitre

b. Litre (l) is the unit used to measure large quantity of liquid. Example: Water tank, petrol tanks, washing machine capacity etc.

Measure capacity in litre


Metric Conversions

Metric conversions


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